Recent folders/files: Remove non-existing directories on attempt to open

[tomlin7]

Feature

The recently opened list may contain directories that no longer exist. On attempt to open such directories from recent links, remove them from database.

The recently opened files/folders are shown as a list in welcome page and through the palette.
These leverage the list method here to generate lambda functions for each recent path.

Modify the lambda to call a custom function that will check if the path still exists. If it exists, proceed to open, otherwise, delete the path from db and return.

[Jawwad011]

To resolve the issue of opening non-existent directories from the recent list:

1. Retrieve recently opened directories from the database.
2. Check if each directory still exists using os.path.exists().
3. Remove non-existent directories from the database.
4. Commit the changes to keep the list updated.

[tomlin7]

@Jawwad011 thanks for the steps, as this is a rough issue outline opened months ago, I didn't document it properly, I'll add more details above.